iokit/Kernel/IOPMPowerSourceList.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 #include <IOKit/pwr_mgt/IOPM.h>
  23 #include <IOKit/pwr_mgt/IOPMPowerSourceList.h>
  24 #include <IOKit/pwr_mgt/IOPMPowerSource.h>
  25
  26 #define super OSObject
  27 OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
  28
  29 //******************************************************************************
  30 // init
  31 //
  32 //******************************************************************************
  33 void IOPMPowerSourceList::initialize ( void )
  34 {
  35     firstItem = NULL;
  36     length = 0;
  37 }
  38
  39 //******************************************************************************
  40 // addToList
  41 //
  42 //******************************************************************************
  43
  44 IOReturn IOPMPowerSourceList::addToList(IOPMPowerSource *newPowerSource)
  45 {
  46     IOPMPowerSource * nextPowerSource;
  47
  48     // Is new object already in the list?
  49     nextPowerSource = firstItem;
  50     while (  nextPowerSource != NULL )
  51     {
  52         if ( nextPowerSource == newPowerSource )
  53         {
  54             // yes, just return
  55             return IOPMNoErr;
  56         }
  57         nextPowerSource = nextInList(nextPowerSource);
  58     }
  59
  60     // add it to list
  61     newPowerSource->nextInList = firstItem;
  62     firstItem = newPowerSource;
  63     length++;
  64     return IOPMNoErr;
  65 }
  66
  67
  68 //******************************************************************************
  69 // firstInList
  70 //
  71 //******************************************************************************
  72
  73 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
  74 {
  75     return firstItem;
  76 }
  77
  78 //******************************************************************************
  79 // nextInList
  80 //
  81 //******************************************************************************
  82
  83 IOPMPowerSource * IOPMPowerSourceList::nextInList(IOPMPowerSource *currentItem)
  84 {
  85     if ( currentItem != NULL ) {
  86        return (currentItem->nextInList);
  87     }
  88     return NULL;
  89 }
  90
  91 //******************************************************************************
  92 // numberOfItems
  93 //
  94 //******************************************************************************
  95
  96 unsigned long IOPMPowerSourceList::numberOfItems ( void )
  97 {
  98     return length;
  99 }
 100
 101 //******************************************************************************
 102 // removeFromList
 103 //
 104 // Find the item in the list, unlink it, and free it.
 105 //******************************************************************************
 106
 107 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
 108 {
 109     IOPMPowerSource * item = firstItem;
 110     IOPMPowerSource * temp;
 111
 112     if ( NULL == item) goto exit;
 113
 114     if ( item  == theItem ) {
 115         firstItem = item->nextInList;
 116         length--;
 117         item->release();
 118         return IOPMNoErr;
 119     }
 120     while ( item->nextInList != NULL ) {
 121         if ( item->nextInList == theItem ) {
 122             temp = item->nextInList;
 123             item->nextInList = temp->nextInList;
 124             length--;
 125             temp->release();
 126             return IOPMNoErr;
 127         }
 128         item = item->nextInList;
 129     }
 130
 131 exit:
 132     return IOPMNoErr;
 133 }
 134
 135
 136 //******************************************************************************
 137 // free
 138 //
 139 // Free all items in the list, and then free the list itself
 140 //******************************************************************************
 141
 142 void IOPMPowerSourceList::free (void )
 143 {
 144     IOPMPowerSource * next = firstItem;
 145
 146     while ( next != NULL ) {
 147         firstItem = next->nextInList;
 148         length--;
 149         next->release();
 150         next = firstItem;
 151     }
 152     super::free();
 153 }
 154
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